The Next Check # field in the Disbursements Tab cannot be edited directly in SMIGL. 
1. To Update the Next Check #, first open the BankRec application. Click Setup, then Bank.
2. Highlight the Disbursement column and click the Edit button (or just double-click the Disbursements column).
3. In the Bank Edit pop-up, click the Update button by Next Check #.
4. Enter the check number in the field provided and click OK.
5. Click Save & Close.
6. Note the updated Next Check # in SMIGL.